hey wait... I dont recognize the 56, but that yellow and orange Chevy truck I do! I've seen it at a car show here in Tacoma, also seen it cruising around town a couple times last summer. Atleast I think thats the truck I've seen...except I dont remember it being a stepside. Beds can change easily. I dont think thats a very common paint job on those trucks though. Too bad there's no licence plates or street signs in the picture...that would help.
Good luck with your search.